How to make the grooves shape
The fastest way may be using the bevel tool and some simple extruding and scaling operations.


Select the desired edge loop with Alt+RMB, then press Ctrl+B. Drag the mouse to set the beveling thickness and use the Mouse Scroll to set the number of subdivisions. In this case I set it to 5, then hit Ctrl+- twice and scale it a bit (S). This way I created a creasing edge to make the groove look smooth with the subsurf modifier enabled.


To make the smooth t-shaped groove just select the edge loop as pictured below and repeat the beveling proces mentioned above.


To make the recess just select some faces, extrude them inwards (E), then scale a bit (S) and translate if needed (G).